Fumigant paint



" No Drawing.

" To all whom it mail concern:

Be it known that I, HENRY A. GARDNER, a citizen of the United States, residing at Vvashington, in the District of Columbia,

provements in Fumigant Paint, of which the following is a specification. This invention is a novel composition having insecticidal, fun 'cidal and bactericidal properties due to't e presence therein of one or more volatile chlorinated derivatives of lgenzol, specifically o-dichlorbenzol.

Commercial o-dichlorbenzol is a clear, almost colorless, chemically stable liquid, which is miscible with most paint and varnish vehicles. It occurs as a principal component of the mother liquor from which p-dichlorbenzol has been crystallized out, and this mother liquor, with or without fur- .20 ther purification or rectification, is included Main the term commercial o-dichlorbenzol as employed herein. The mother liquor may contain in addition to o-dichlorbenzol, vary- I ing amounts of p-dichlor and monochlor benzol, and possibly some meta-dichlorben- 201 and even trichlorbenzol. A typical sam- .ple of the .material-showed the following 7 characteristics:

Appearance: Clear and free from suspended matter.

Color: Faint straw yellow. Odor: Penetrating. "MW Specific gravity by hydrometer: 1.270 at 609E. .12: .l1- ..f"f I Spot test on paper after 30 minutes: No

1'1 stain left- Flash point (Tagliabue closed cup) 121 F.

Initial boiling point: 140 C. 40 Final boiling point: 183 C.

98% distils between C. and 183 C. 2% residue gives neutral reaction.

Distillation percentages.

45 14:0150 C 3% 160 C 22% 170 C 27% -183 C 46% Commercial o-dichlorbenzol is miscible with practically all liquids employed in paint and varnish manufacture, including dryin and other oils, naphthas, turpentine. '55 etc. %n a series of tests with heavy bodied oils and the follow ng re ults were Specification of Letters Patent.

",5 have invented certain new and 'nsefuldm- HENRY A. GARDNER, OF WASHINGTON, DISTRICT OF COLUMBIA.

FU'MIGAN T PAINT.

Patented Apr. 5, 19 21.

Application filed December 27, 1920. Serial No. 433,396.

obtained, indicating the minimum propor- V. tion of commercial o-dichlorbenzol which may be added wlthout inr'olving separation:

l Heaw a 1 1301a I Damar- Lauri Copalordinary ale i p g $323 Batavi N o. 1, Kongo, Pontiest part 1 part. 1 part. 1 part. anak, India, 1 1 part. 1 part.

Soluble Soluble Soluble Swells Swells lnsol- Soluble in 1 art in 1.5 I in 1.5 and and uble. in 1.5 o-dic or parts parts softens. softens. arts benzol. o-dichloro-dichlor- 7 1 a- 'ohlor 1N0 s epapenzol. benzol... benzol. ration lNo sepa- .No sepa- No sepa by dllllration ration ration tion. by dilu- ,by diluby dllu tion. tion. tion.

According to the present invention chlorinated benzol is employed in sufficient proportions as a component of Wish compositions to impart thereto the desired fumigant properties, this term being used to "indicate an 'ins ec i fungicidal cfi'ect. r v ---In the preferred embodiment of this invention my novel composition comprises a pigment which is preferably White; a filmforming bonding substance such as linseed,

tung or other drying oil; and o-dichlorbenzol, with or without other solvents or thinners. Such compositions can be employed without risk to human life or health, and are of great utility for many purposes, more particularly as wall paints for the interior of warehouses and other storage'plants or receptacles where vast damage is now suffered through the ravages of insects and other pests, vermin, etc.

As a typical illustrative example of the invention, a paint composition was prepared as follows:

100 parts of a white opaque pigment comprising 70% of lithopone and.30% of magnesium silicate were compounded with 50 parts of a vehicle comprising 30% of bonding agent (linseed or treated tung oil), 40% of thinner (as mineral spirits or turpentine) and 30% of commercial o-dichlorbenzol. The resulting paint was applied to wood, and was tested for its efficacy as an insecticide. Qgclggoaches confined in proximity to the freshly painted surfaces were killed within ten minutes, while others were practically unaffected by one hundred minutes confinement in proximity to similar freshly painted surfaces in which the o-dichlorbenzol had been substituted by mineral spirits and turpentine respectively. Fungicidal and bactests indicate similar for the o-dichlorbenzol composition.

---composition of the paint or varnish may be i 'wide1y varied without departure from my invention, according to the specific purpose jor which, it is intended. The composition --;;may be spread by brush or sprayover the *wall areas of --warehouses, or the interior lc' 'surfaces of cupboards, drawers, closets or other confined spaces not usually painted but chlorinated benzol derivative is evolved gradually during the drying process, asserting its insecticidal effect. The drying of the paint is not retarded-and the dried film is hard, white, clean, light-reflecting and durable. When applied to yellow pine, cypress positions exhibit a superior penetration, in-

dicating their applicability as a priming coat for all paints applied to wood-work. For special applications in which a pigment is not desired, this may be omitted, the orresponding proportion of o-dichlorbenzol introduced for example riinto Tiknown or desired varnish compositions, usually in replacement of a corresponding quantity of volatile solvent or thinner. But in the preferred embodiment of my inventionl include in the composition the pigment and the bonding agent therefor.

As already stated, my preferred fumigating component for these coating composition s is odichlorbenzol or the commercial liquid product containing the same, not only by reason of the excellent iumigant prop- "'ITerties of this compound, but because of purity, is av soluble solid of high volatility .,,...often over-run by vermin or insects. The

siucffiistruemml woods the'prese'ntcom its eflicacy as a solvent. Nevertheless my invention is be obtained by substitutin o-dichlorbenzol wholly or in part by other e lorinated benzol derivatives, as p-dichlorbenzol and monochlorbenzol. P-dichlorbenzol, in a state of even at ordinary temperatures, and may be incorporated in any preferred paint or varnish composition. 7

In cases where a very li 'ht color is not rea highly efiicient bonding agent-for the pigment component of these paints is the so-cal'led dechlorinated mineral oil, of

the type disclosed in application Serial No. I, n

343,458, filed Dec. 9, 1919, Gardner and Bie- 5 IOIjICSS, or combinations thereof with tung oil. ...la. .i... V v V a. .w .M w... c

1. A fumigant coating composition containing a chlorinated benzol derivative. 1 I 2. A fumigant coating composition containing a di-chlorinated benzol derivative.

. 3. A fumiga nt coating composition 0on5 tainmg o-dichlorben..: U :1: 4. 15k iumigant ompositiorr eont in e ing a pigment, a I -forming bonding substance, and a chlorinated benzol derivative.

5. A fumigant paint composition containing a pigment. a. film-forming bonding substance, and a di-chlorinated benzol vderivative.

I 7.0 6. A fumigant paint composition containing a pigment, a film-forming bonding sub stance, and o-dichlorbenzol. In testimony whereof, I afiix my signature.

. HENRY 'A.-GABDNER.

7 not limited thereto in; its 40 L It will ofc'o'urse be understood that the .broader aspects, since similar results may e 

